Will MSIX support installation of Windows services? We have a scenario in which customers have unattended computers that need to continue working across power failure/restoration, and Windows services provide our best solution.

The same way MSIX brings all the packaging features to any app that were originally only available to UWP/Store apps, giving regular apps a bit of a boost in terms of lifecycle and rights management, it would be nice to have MSIX for Windows Services with support for traditional Windows Services use-case scenarios but also "UWP Background Task"-like features with stricter resource management, system triggers, etc.

Also, with the "sandboxing" features of MSIX, it could be a very interesting alternative to Containers on servers to achieve even higher deployment density, pretty much the same as hosting services as processes, but still with an extra layer of protection around it.